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赤峰地区敖汉苜蓿冻害及其防御技术

DOI: 10.3321/j.issn:1000-7091.2001.01.026, PP. 136-142

Keywords: 苜蓿冻害,防御技术,越冬

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Abstract:

敖汉苜蓿在赤峰地区受冻有4种表现,(1)全株未受冻;(2)根颈上端受冻变黑,下端仍能再生新芽;(3)根颈全部和根的部分受冻变黑,不能再生新芽;(4)全株受冻死亡。引起冻害的主要原因是苜蓿播种期晚和根颈入土浅。研究结果表明,越冬前苜蓿具有2个以上分枝,根颈入土深度5cm以上,以及根颈膨大,直径达0.3cm以上者,方能减轻或避免受冻。适时早播或带肥播种,延长苜蓿生长期和促进幼苗生长,同时在封冻前对平作进行浅耕覆土或深开沟冻磨平,均能增加根颈保温层,有效提高苜蓿越冬率。

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